China Mines disappear after host structure sell

[xezon]

China Mines disappear after host structure sell. There is no native option to change this.

DegenPercentPerSecondAfterCreatorDies does control despawn time after structure death.

  Behavior GenerateMinefieldBehavior
    MineName
    UpgradedMineName
    UpgradedTriggeredBy
    GenerationFX
    DistanceAroundObject
    MinesPerSquareFoot
    GenerateOnlyOnDeath
    BorderOnly
    SmartBorder
    SmartBorderSkipInterior
    AlwaysCircular
    Upgradable
    RandomJitter
    SkipIfThisMuchUnderStructure
    TriggeredBy
    ConflictsWith
    RemovesUpgrades
    FXListUpgrade
    RequiresAllTriggers
    
  Behavior MinefieldBehavior
    DetonationWeapon
    DetonatedBy
    StopsRegenAfterCreatorDies
    Regenerates
    WorkersDetonate
    CreatorDeathCheckRate
    ScootFromStartingPointTime
    NumVirtualMines
    RepeatDetonateMoveThresh
    DegenPercentPerSecondAfterCreatorDies
    CreationList